The mechanism of the surface colouration of the flame - retardant nylon product and its application are introduced.介绍阻燃尼龙制品表面着色的机理及其应用.The developments of technologies for plastics colouration with colour master - batche...
The smooth surface of the lake reflected the bright full moon.平静的湖面反映出明亮的圆月。A crescent moon peeped out from behind the clouds.一弯新月从云中出现....the first man on the moon...登上月球的第一人The moon waxes and wanes every month.月亮每个月都有圆...